Unexpected large room-temperature ferromagnetism in porous Cu2O thin films

被引：19
作者：
Hou, Xue [1 ,2 ]
Sun, Huiyuan [1 ,2 ]
Liu, Lihu [1 ,2 ]
Jia, Xiaoxuan [1 ,2 ]
Liu, Huiyuan [1 ,2 ]
机构：
[1] Hebei Normal Univ, Coll Phys Sci & Informat Engn, Shijiazhuang 050024, Peoples R China
[2] Key Lab Adv Films Hebei Prov, Shijiazhuang 050024, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2015年 / 382卷
关键词：
Porous Cu2O films; Room-temperature ferromagnetism; Oxygen vacancy; OXIDE;
D O I：
10.1016/j.jmmm.2015.01.041
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Porous Cu2O films have been fabricated on porous anodic alumina substrates using DC reactive magnetron sputtering with pure Cu targets, and unexpectedly large room temperature ferromagnetism has been observed in the films. The maximum saturation magnetic moment along the out-of-plane direction was as high as 94 emu/cm(3). Photoluminescence spectra show that the ferromagnetism originates with oxygen vacancies. The ferromagnetism could be adjusted by changing the concentration of oxygen vacancies through annealing in an oxygen atmosphere. These observations suggest that the origin of the ferromagnetism is due to coupling between oxygen vacancies with local magnetic moments in the porous Cu2O films, which can occur either directly through exchange interactions between oxygen vacancies, or through the mediation of conduction electrons. Such a ferromagnet without the presence of any ferromagnetic dopant may find applications in spintronic devices. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：20 / 25
页数：6
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